wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int arr[67]; arr[67]=5; | int arr[67]; if(67<67){{}} else arr[67]=5; | Bounds check. | C++ |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
JOIN profiles ON orders.id = profiles.status | JOIN profiles ON orders.id = profiles.status | Correct. | SQL |
if a = 48: | if a == 48: | Use == for comparison. | Python |
if (data = 51) | if (data == 51) | Use ==. | C++ |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
name: result
age: 71 | name: result
age: 71 | Correct. | YAML |
function baz() {{ echo 'test'; }} | function baz() {{ echo 'test'; }} | Correct. | PHP |
println('test') | println("test") | Double quotes. | Scala |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(72); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(72, () => console.log('listening')); | Add callback. | Node.js |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<input type='text' value='message'> | <input type='text' value='message' name='name'> | Add name attribute. | HTML |
json.sqrt(24) | import json
json.sqrt(24) | Import module first. | Python |
status: message
value: hello, | status: message
value: hello | Remove comma. | YAML |
INSERT INTO users VALUES ('data',47) | INSERT INTO users (name, email) VALUES ('data',47); | Specify columns. | SQL |
var x = 13; | var x = 13; | Correct. | Dart |
<person><desc>data</desc><desc>98</desc></person | <person><desc>data</desc><desc>98</desc></person> | Add closing >. | XML |
<p>output <b>world</p></b> | <p>output <b>world</b></p> | Nest properly. | HTML |
for (int i=0; i<24; i++) {{}} | for (int i=0; i<24; i++) {{}} | Correct. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let b = 24; b += 1; | let mut b = 24; b += 1; | Need mut to modify. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (index = 85) {{}} | if (index == 85) {{}} | Use ==. | Kotlin |
cin >> a
cout << a; | cin >> a;
cout << a; | Add semicolon. | C++ |
$index = 44; if ($index = 44) {{}} | $index = 44; if ($index == 44) {{}} | Use ==. | PHP |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
let num: Int = 'test' | let num: String = 'test' | Fix type. | Swift |
while index > 90
index -= 1 | while index > 90:
index -= 1 | Colon missing after while. | Python |
print 'info' | print('info') | print needs parentheses. | Python |
yield b | yield b | Correct yield. | Python |
if (result = 10) {{}} | if (result === 10) {{}} | Use === for equality. | JavaScript |
test | test() | Add parentheses. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
list[90] | if (length(list) >= 90) list[90] | Check length. | R |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
print 'world' | print 'world'; | Add semicolon. | Perl |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
["result", 54] | ["result", 54] | Correct. | JSON |
b == '48' | b === 48 | Use strict equality. | JavaScript |
[96, 73, 86 | [96, 73, 86] | Close bracket. | Ruby |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
items(90) | if length(items) >= 90, items(90), end | Check length. | MATLAB |
for i=1,33 do print(i) end | for i=1,33 do print(i) end | Correct. | Lua |
for index in range(47)
print(index) | for index in range(47):
print(index) | Colon after for. | Python |
my @arr = (75,56,79); | my @arr = (75,56,79); | Correct. | Perl |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
int[] values = new int[2];
values[2] = 5; | int[] values = new int[2];
if (2 < values.length) values[2] = 5; | Check bounds. | Java |
{{'age':85, 'name' 11}} | {{'age':85, 'name':11}} | Colon missing. | Python |
assert data > 7 | assert data > 7 | Correct. | Python |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
var x int | var x int | Correct. | Go |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
function process(): void {{ return 37; }} | function process(): number {{ return 37; }} | Return type mismatch. | TypeScript |
if ($foo = 38) | if ($foo == 38) | Use ==. | Perl |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
class Person {{ int num; }}; | class Person {{ public: int num; }}; | Make public. | C++ |
if result > 45
print('hello') | if result > 45:
print('hello') | Colon missing after if. | Python |
handle | handle() | Add parentheses. | Swift |
<person age=55> | <person age="55"> | Quote attribute. | XML |
SELECT name role FROM users; | SELECT name, role FROM users; | Add comma. | SQL |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
values[8] | if (values.indices.contains(8)) values[8] | Check index. | Kotlin |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
if b = 39 {{}} | if b == 39 {{}} | Use ==. | Swift |
if ($index = 56) {{}} | if ($index -eq 56) {{}} | Use -eq. | PowerShell |
local val = 68 | local val = 68 | Correct. | Lua |
// comment | /* comment */ | Use /* */. | CSS |
if (num = 29) | if (num == 29) | Use ==. | Scala |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
if data = 79 then
print('data')
end | if data == 79 then
print('data')
end | Use ==. | Lua |
if a = 39 | if a == 39 | Use ==. | MATLAB |
int item = 'data'; | String item = 'data'; | Type mismatch. | Dart |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
<br></br> | <br> | Self-closing. | HTML |
let v=vec![43,79,13]; let first=&v[0]; v.push(32); | let mut v=vec![43,79,13]; let first=v[0]; v.push(32); | Copy instead of reference. | Rust |
if count > 2
puts 'world' | if count > 2
puts 'world'
end | Add 'end'. | Ruby |
var b int = 'result' | var b string = 'result' | Type mismatch. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let result: number = 'hello'; | let result: string = 'hello'; | Fix type. | TypeScript |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
val num: Int = 'data' | val num: String = 'data' | Fix type. | Kotlin |
SELECT * FROM products WHRE age=66; | SELECT * FROM products WHERE age=66; | Fix WHERE. | SQL |
function baz(num)
print(num)
end | function baz(num)
print(num)
end | Correct. | Lua |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let item = 23; | let item = 23; | Correct. | JavaScript |
function process() {{
return
{{key:'message'}}
}} | function process() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
h1 {{ font-size:15px color:green; }} | h1 {{ font-size:15px; color:green; }} | Add semicolon. | CSS |
class User {{ int b; }}
obj.b=5; | class User {{ public int b; }}
obj.b=5; | Make field public. | Java |
{{'id':'output'}} | {{"id":"output"}} | Use double quotes. | JSON |
{{"name":"result" "title":3}} | {{"name":"result", "title":3}} | Add comma. | JSON |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
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